Do modern mobile phones put out a weaker signal?

Hi Dr Chris ,
I was listening to one of the "up all night" or dr karl podcasts that you were hosting and a user was asking why do we turn off mobile phones in hospitals and airplanes.
I have a story that may explain why this was necessary , but I assume that todays phones dont output the same levels of power.
Back about 18 years ago , I was commissioned to install and upgrade Dimms inside of the equivalent of EftPos machines for a bank in Western Australia. This involved going out on site country locations , replacing the Dimm with a new dim and ringing the technical support centre to program it up and get it going .
Unfortunately we had what seemed to be a large quantity of faulty dimms , I would ring into the tech support to enable the new chips and they would fail , but when the chips went back they were perfect and worked fine on the benchtops.
We eventually worked out that the Motorola Dynatac that I was using was causing enough interference so that the "hardwired"(they used physical POTS phone lines) eftpos machine failed when it was communicating back to the central techs .
Also any person that was on a mobile phone call ( luckily they weren't so popular back then) would cause the eftpos machine to fail while it was in transaction back to the bank.
So .. yes I can see why they would not have wanted mobile phones being used in hospitals and or planes back then. But I assume todays phones put out a much weaker signal .
P.S. This was back in the analogue days when the range of the mobile phone towers was so much greater because of the higher strength I assume

Carl
Perth , Western Australia.